Portable driving-head.



W. D. SHERWOOD.

PORTABLE DRIVING HEAD.

APPLICATION FILED PBB.8, 1910.

988,214, Patented Mar.28, 1911. O 5 SHEETS-SHEET 1.

W. D. SHERWOOD.

PORTABLE DRIVING HEAD.

APPLICATION FILED mum, 1910.

988,214, Patented Mar. 28, 1911.

5 SHEETS-SHEET 2.

WITNESSES: INVENTOR la/0%. I

' ATTORNEY W. D. SHERWOOD.

PORTABLE DRIVING HEAD.

APPLICATION FILED PEB.8, 1910.

988,214. I Patented Mar. 28, 1911.

5 SHEETS-SHEET 4.

WITNESSES INVENTOR ATTORNE V W. D. SHERWOOD. PORTABLE DRIVING HEAD.

APPLICATION FILED F1118, 1910.

988,214, Patented Mar. 28, 1911 5 SHEETS-SHBET 5.

w M I WITNESSES:

v M.% aw/aum l 117 Y tgm Afro/my UNITED sTAir srATENT OFFICE WILLIAM D.SHERWOOD, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE VALVE SEATING TOOLCOMPANY, OF FAIRFIELD, CONNECTICUT, A CORPORATION OF CON- NECTICUT.

PORTABLE DRIVING-HEAD.

'['0 all whom it may concern:

Be it known that I, lViLLiAM D. SHER- u'oon, a citizen of the UnitedStates, residing at Bridgeport, county of F airfield, State ofConnecticut, have invented an Improvement in Portable Driving-Heads, ofwhich the following is a specification.

This invention has for its object to produce a portable driving headadapted for general use in driving tools as in grinding valves, indrilling and for carrying grinding, polishing and butting wheels, whichmay be conveniently carried to any place where the work is to be done,may be operated in any position and which when intended for general useshall be provided with mechanism for producing both oscillatory androtary movement of a chuck, collet or tool holder, a simpler form of thehead being adapted for valve grinding and other uses requiringoscillatory movement only.

Vith these and other objects in view I have devised the simple and noveldriving head of which the following description in connection with theaccompanying drawings is a specification, reference characters beingused to indicate the several. parts.

Figure 1 is a longitudinal section of the forward end of my noveldriving head illustrating mechanism for producing both oscillatory androtary movement; Fig. 2 a longitudinal section of the entire headshowing the shaft as driven by an electric motor; Figs. 3, 4, 5 and (lare transverse sections, on an enlarged scale, on the lines indicatedrespectively by 3-3, 44, 55, and 6-6 in Fig. 2, looking in the directionof the arrow; and Fig. 7 is an elevation partly in longitudinal section,illustrating a simplified form of my novel driving head adapted toproduce oscillatory movement only as for valve grinding.

13 to which a breast piece and handle, indi- Specification of LettersPatent.

Application filed February 8, 1910.

Patented Mar. 28, 1911.

Serial No. 542,762.

1 cated as a whole by 14, is secured in any scribe it briefly.

16 denotes the armature, 17 the poles, 18 the commutator and 19 thecarbon brushes which are carried by brackets 20 upon the inner side ofrear end piece 12. The wires (not shown) enter the head through a hole21 in the rear end piece and are connected to terminals 22 carried bythe brackets. The armature and commutator are carried by a driving shaft24 which rotates in bushings 25 and 26, bushing 25 being seated in hub13. The poles are secured to the body by screws 27, the pole windingsbeing indicated by 28. The body is provided externally with threadedhubs 29 which receive handles 30, one or both being used as mostconvenient. Bushing 26 for the driving shaft is seated in an oscillatingshaft 31 which carries a. crank 32 and is itself journaled in bushings33 and 34. Bushing 33 is seated in a gear wheel 35 carried by a sleeve36 in which bushing 34 is seated. Sleeve 36 is adapted to rotate inbushings 37 and 38, bushing 37 being seated in a hub 39 projecting fromfront end piece 11.

40 denotes a driving pinion carried by the driving shaft and having ahub 41 which bears against the end of oscillating shaft 31, the drivingshaft having a shoulder 42 against which the pinion is seated. Thispinion meshes with gear wheels 43 and 44. Gear wheel 43 is journaled onastud carried by a bracket 45 extending inward from the body, and gearwheel 44 is journaled on a stud 51 carried by a bracket 46 extendinginward from the opposite side of the body.

47 denotes a link the ends of which are pivoted respectively to gearwheel 43 and to crank 32 (see Fig. 6 in connection with Fig. 1) wherebyoscillatory movement is imparted to the crank and to shaft 31 for apurpose presently to be explained. Gear wheel 44 is provided with a hub48 carrying a pinion 49 which meshes with gear wheel on sleeve 36.

52 denotes a chuck, collet or tool holder which is secured to bushing 38with a drive fit.

53 denotes a ball bearing between bushnig 3S and the chuck and bushing37 and hub 39 on end piece 11. This bearing takes the end thrust of thechuck in use.

The special form of chuck, collet or tool.

' the chuck and shifting ring respectively.

57, see Fig. 3, denotes push pins which are providedwith heads 58 seatedin sockets 59 in chuck 52 and bushing 38 and adapted to be forced intosockets 60 in sleeve 36 and bushing 34 to lock the sleeve and bushing 34to the chuck and bushing 38. Springs 61 in sockets 59 bear against thebases of the sockets and against the heads of the pins and act normallyto withdraw the pins from sockets 60 and force them against cam walls 62in the inner face of the shifting ring (seeFig. 3 in connection withFig. 1). These cam walls are so laid out that when heads 58 of the pushpins are in engagement with the high portions of the cam walls the pushins will be forced into sockets 60 and will lock the chuck to sleeve 36and bushing 34, which have rotary movement only, thus imparting rotarymovement to the chuck and the tool carried thereby, this being theposition of the parts shown in the drawings. lVhen the shifting ring isoscillated to place the low portions of cam walls 62, which areindicated specifically by 63, in alinement with the push pins, thesprings will force the pins outward and disengage them from sleeve 36and bushing 34, thus leaving the chuck disconnected from the sleeve.This position of the parts is not shown in the drawings but will beobvious from Fig. 3.

Turning now to Fig. 5, 64 denotes push pins which are provided withheads 65 seated in sockets 66 in chuck 52 and bushing 38 and adapted tobe forced into a transverse hole 67 in oscillating shaft 31 to lock saidshaft to bushing 38 and the chuck. Springs 68 in sockets 66 bear againstthe bases of the sockets and against the heads of the pins and actnormally to withdraw the pins from hole 67 in the oscillating shaft andforce them against cam walls 69 in the inner face of the shifting ring.These cam walls are the reverse of the other set of cam walls and are solaid out that when the heads 65 of the push pins are in engagement withthe low portions of the cam walls the push pins will be withdrawn by thesprings from hole 67 in the oscillating shaft leaving the chuckdisconnected from said shaft, as shown in Fig. 5, this position of theparts corresponding with Fig. 3. When the shifting ring is oscillated toplace the high portions 0 cam walls 69, which are specifically indicatedby 70, in alinement with the push pins, said pins will be forced forwardinto hole 67 in the oscillating shaft and will lock the chuck to saidshaft, thus imparting oscillatory movement to the chuck and the toolcarried thereby. This position of the parts is not shown in the drawingsbut will be obvious from Fig. 5.

The shifting ring is locked in either of its engaging positions by meansof a locking pin 71 seated in a socket 72 and forced outward by a spring73 into engagement with a hole 74 in the shifting ring to lock said ringin position to produce rotary movement of the chuck, as in Fig. 5, andinto engagement with a hole 75 in the ring to lock said ring in positionto produce oscillatory movement of the chuck. The shifting ring inpractice is knurled and it will be noted that the forward end of thelocking pin is rounded so that the application of alittle power to thering will disengage the locking pin from either of the locking holes andpermit the ring to be oscillated to disenproducing rotary movement isdispensed with. Driving shaft 24 carries a pinion 40 which meshes with agear wheel 43 mounted on stud 50 carried by bracket 45 as before. Theoscillating shaft 31, crank 32 and link 7 are the same as before,likewise the bushing 26 seated in the oscillating shaft in which thedriving shaft has its bearing. The oscillating shaft has its bearing ina sleeve 77 seated in hub 39 on end piece 1.1 and having a flange 78hearing on said hub. The chuck, collet or tool holder is secureddirectly to the oscillating shaft (ordinarily with a drive fit) insteadof to a bushing which may have either oscillatory or rotary movement.The ball bearing takes up the end thrust of the chuck as in the otherform.

The operation of the form illustrated in Fig. 7 will be obvious from thedrawing. Rotation of the driving shaft by means of pinion 40, gear wheel43, link 47 and crank 32 produces oscillatory movement of the chuck ortool holderas is required in valve grinding, in which a screw driver orother 7 suitable tool is carried by the chuck or holder and oscillatesthe valve to grind it. In practice, with my novel driving head I am ableto grind a valve in from five to ten minutes that it would take severalhours and frequently half a day to grind by hand.

In the form illustrated in Figs. 1 to 6, inclusive, for valve grindingor any operation requiring oscillation of the tool, the shift ing ringis oscillated from the position shown in Figs. 1 and 2, whichcorrespoi'ids with the position of the parts in Figs. 3 and 5, andlocking pin 71 is disengaged from hole 74 in the shifting ring andcaused to engage hole 75 in said ring. As the ring is oscillated, heads65 of push pins 64 will ride up on the high portions of cam walls 69 andthe pins will be forced into engagement with transverse hole 67 in theoscillating shaft, thus locking the chuck or 'tool holder to said shaft.It will be understood of course that this shaft oscillates continuallywhile the driving shaft is in rotation and in order to impartoscillatory movement to the tool holder it is simply required to lock itto the oscillating shaft. To produce rotary movement of the chuck ortool holder, it is required to disengage it from the oscillating shaftand to connect it to sleeve 36 which is' always rotating. This iseffected by moving the shifting ring from the position just described,in which locking pin 71 is in engagement with hole 7 5 in the ring, tothe position shown in Figs. 3 and 5, in which locking pin 71 is inengagement with hole 74: in the ring. This movement causes the heads ofpush pins 64 to ride down from high portions 70 of cam walls 69 into engagement with the low portions of said cam walls, springs 68 forcing thepush pins out of engagement with transverse hole 67 in the oscillatingshaft and heads 68 of push pins 57 riding up from low portions 63 to thehigh portions of cam walls 62 and forcing the push pins against thepower-of springs 61 into engagement with bushing 34.- and rotatingsleeve 36, which in this form carries the chuck or tool holder, so thatthe rotary movement of the sleeve is imparted to the chuck or toolholder. It will thus be seen that oscillation of the shifting ring isthe only movement required to change from rotary to oscillatory movementof the tool holder, and vice versa.

Having thus described my invention I claim:

1. A portable driving head of the character described comprising adriving shaft, an oscillator shaft driven thereby, a rotary sleeve alsoriven by said driving shaft, a tool holder, and means for operativelyconnecting said tool holder with either said oscillatory shaft or saidrotary shaft.

2. A portable driving head of the character described comprising adriving shaft,

an oscillatory shaft in which one end of said driving shaft is rotatablymounted, a tool holder operatively connected with said oscillatoryshaft, and means operated by said driving shaft for oscillating saidoscillatory shaft.

3. In a device of the character described, the combination with adriving shaft and a tool holder, of intermediate mechanism for producingeither rotary or oscillatory movement of the tool holder and anoscillatory shifting ring and connections for shifting from one movementto the other.

1. In a device of the character described, the combination with adriving shaft, a pinion carried thereby and a tool holder, of gearingdriven from said pinion whereby either oscillatory or rotary movementmay be imparted to the tool holder, an oscillatory shifting ring, andconnections for shifting from one movement to the other.

5. In a device of the character described, the combination with adriving shaft, a pinion carried thereby and a tool holder, of gearwheels meshing with said pinion, a pinion carried by one of said gearwheels, :1 rotating sleeve carrying a gear wheel meshing with saidsecond pinion, an oscillating shaft: carrying a crank, a link pivoted tosaid crank and to the gear wheel meshing with the first pinion and notitself carrying a pinion, an oscillating shifting ring and meanscontrolled thereby for connecting the tool holder to either the rotatingsleeve or the oscillating shaft.

6. A portable driving head of the character described comprising adriving shaft. a drive pinion secured thereto, a gear wheel meshing withsaid pinion, an oscillatory shaft provided with a crank arm adjacentsaid gear wheel, a link having one end con nected to said crank arm andthe other end connected with one face of said gear wheel, and a toolholder operatively connected with said oscillatory shaft.

7. In a device of the character described, the combination with adriving shaft, a pinion carried thereby and a tool holder, of gearwheels meshing with said pinion, a pinion carried by-one of said gearwheels, a rotating sleeve carrying a gear wheel. meshing with saidsecond pinion, a shaft mounted to oscillate in said sleeve, a crankcarried by the oscillating shaft, a link pivoted to said crank and toone of the firstmentioned gear wheels, and means for connecting the toolholder to either the rotating sleeve or the oscillating shaft.

8. In a device of the character described, the combination witharotating sleeve and a shaft mounted to oscillate therein, of a toolholder and means for connecting the tool holder to either the sleeve orthe shaft.

9. In a device of the character described, the combination with arotating sleeve, a

shaft mounted to oscillate in said sleeve and a tool holder, of anoscillating shifting ring and means controlled by said ring forconnecting the tool holder to either the shaft or the sleeve.

10. In a device of the character described,

I. the combination with a rotating sleeve, a

shaft mounted to oscillate in said sleeve and a tool holder, of anoscillating shifting ring, means controlled by said ring for connectingthe tool holder to either the shaft or the sleeve and means for lockingthe sleeve at either of its adjustments.

11. In a device of the character described, the combination with arotating sleeve, an

I oscillating shaft and a tool holder, of a shift- 13. In a device ofthe character described, a

the combination with a rotating sleeve, an oscillating shaft and a toolholder, of a shifting ring having reverse sets of cam walls, spring pushpins actuated by said walls to lock the tool holder to either the shaftor the sleeve and means for locking the shiftingring at either of itsadjustments.

14. In a device of the character described, the combination with arotating sleeve, an oscillating shaft and atool holder, of ashiftingring having reverse sets of cam walls and locking holes, springpush pins actuated by the cam walls to lock the tool holder to eitherthe shaft or the sleeve and a spring locking pin adapted to engageeither of the locking holes to lock the shifting ring at eitheradjustment.

15. In a device of the character described, the combination with arotating sleeve, an oscillating shaft and a tool holder, of a shiftingring having reverse sets of cam walls, said tool holder and shiftingring having half-sockets, a spring ring in said halfsockets to retainthe shifting ring in place, and spring push pins actuated by the camwalls to lock the tool holder to either the shaft or the sleeve.

16. In a device of the character described, the combination of a toolholder, an oscillatory shaft to which it is attached and which isprovided with a crank, a head in which the shaft is journaled, a gearwheel jourlnaled inthe head, a link pivoted directly to the gear wheeland to the crank, an electric motor withinthe head and drivingconnections between said motor and the gear wheel.

17. In a device of the character described, the combination of aportablehead, a motor secured therein, a gear wheel journaled therein, a pinioncarried by the motor and meshing with the gear wheel, an oscillatoryshaft, a crank carried thereby, a link pivoted to the crank and directlyto the gear wheel and a tool holder carried by the shaft.

18. In a device of the character described, the combination of a motor,a pinion on the motor shaft, a gear wheel meshing with said pinion, anoscillatory shaft, a crank carried thereby, a link pivoted directly tothe gear wheel and to the crank and a tool holder carried by theoscillatory shaft.

19. In a device of the character described, the combination of aportable head, a motor secured therein, a pinion upon the motor shaft,agear wheel meshing with the pinion, an oscillating shaft, a crankcarried thereby, a link pivoted directly to the gear wheel and to thecrank, a tool holder carried by the oscillating shaft and a ball-bearingintermediate the tool holder and the head.

20. In a device of the characterdescribed, the combination of a toolholder, an oscillatory shaft, a rotary sleeve, means for connecting thetool holder to either the shaft or the sleeve, a crank carried by theshaft, a gear wheel carried by the sleeve, a gear wheel having linkconnection with the crank, an electric motor and driving connectionsintermediate the gear wheels and the motor.

21. In a device of the character described, the combination of aportable head, an electric motor therein, a tool holder, an oscillatoryshaft, a rotary sleeve, intermediate driving connections between themotor and the shaft and the sleeve and means for con necting the toolholder to either the shaft or the sleeve.

22. In a device of the character described, the combination of aportable head, an electric motor therein, a tool holder, an oscillatoryshaft, a rotary sleeve, intermediate driving connections between themotor and the shaft and the sleeve, an oscillatory shifting ring havingreverse cam walls, and spring push pins actuated by the cam walls tolock the tool holder to either the shaft or the sleeve.

23. In a device of the character described, the combination of aportable head, an electric motor therein, a tool holder, an oscil-'latory shaft, a rotary sleeve, intermediate driving connections betweenthe motor and the shaft and the sleeve, an oscillatory shifting ringhaving reverse cam walls, spring push pins actuated by the cam walls tolock the tool holder to either the shaft or the sleeve and means forlocking theshifting ring at either of-its adjustments.

24. In a device of the character described, 1 for the purpose set forth,and driving conthe combination of a portable head, an eleonectionsintermediate the motor and the trio motor therein, a tool holder havingtWo shaft and the sleeve. sets of sockets, spring push pins in said Intestimony whereof I aflix my signature 5 sockets, an oscillatory shafthaving a transin presence of two Witnesses.

verse hole adapted to be enga ed by one set of push pins, a rotarysleeve iiaving sockets WILLIAM OO adapted to be engaged by the other setWitnesses: of push pins, a shifting ring having sets of CORA DoUGLAs, 1ecam walls to actuate the sets of push pins, S. W. ATHER'roN,

